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Securities (Tables)
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of the Securities Available-for-Sale and Held-to-Maturity
Securities available-for-sale for continuing operations consisted of the following at December 31, 2012:
 
December 31, 2012
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
Money market funds
$
80

 
$
—

 
$
—

 
$
80

Securities available-for-sale
$
80

 
$
—

 
$
—

 
$
80